BK Precision 1601 Instruction Manual page 8

ure 2 shows a typical example. The power supply
offers overload protection; therefore, any fuse in the
equipment's power cable is not required during
testing. In fact, a convenient connection point may
be to the fuseholder. Normally, the equipment chas-
sis should be grounded. Usually, the negative po-
larity of the equipment is common with the chassis
and a jumper may be connected between the (* )
and (-) terminals of the power supply.
In those cases where the chassis is not common
with the negative polarity, connect a separate test
lead free from the ( -h- ) terminal of the power supply
to the chassis of the equipment being serviced.
Figure 3 shows the proper interconnection between
the power supply and the equipment under test for
all possible situations.
POWER SUPPLY #l
POWER SUPPLY #2
Figure 4. T
8
EQUIPMENT
POWER
BEING
POWERED
SUPPLY
E Q U P M E N T
BEING
POWER
POWERED
SUPPLY
Figure 3. Power Supply Interconnect Possibilities
Power Supplies Connected in Parallel for 4 Amp Output
WO
If there is any doubt that the chassis m a y n o t b e
common with the negative polarity, use a se-
ground connection from the (*l terminal
equipment chassis. No damage can result
technique is used.
Set the power supply voltage to the specification
voltage for the equipment being serviced (normally
the voltage value of a fully charged vehicle battery).
Set the current limit to the maximum input current
specification plus 5%. If specification information
is unavailable, start with a moderate current limit
and find the overload threshold. Increase the c u r -
rent limit 5% above threshold to prevent
turn-off during testing. Note that most solid s t a t e
receivers have a much higher load current with
strong audio output. Therefore, the threshold should
POWER
POWER
SUPPLY
RECOMMENDED ONLY FOR
overload
EQUIPMENT
BEING
POWERED
EQUIPMENT
BEING